# Yahoo! UI Library

### Charts Widget 2.8.1

Yahoo! UI Library > charts > CartesianChart.js (source view)
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    /**
     * CartesianChart class for the YUI Charts widget.
     *
     * @namespace YAHOO.widget
     * @class CartesianChart
     * @uses YAHOO.widget.Chart
     * @constructor
     * @param type {String} The char type. May be "line", "column", or "bar"
     * @param containerId {HTMLElement} Container element for the Flash Player instance.
     * @param dataSource {YAHOO.util.DataSource} DataSource instance.
     * @param attributes {object} (optional) Object literal of configuration values.
     */
     YAHOO.widget.CartesianChart = function(type, containerId, dataSource, attributes)
    {
    	YAHOO.widget.CartesianChart.superclass.constructor.call(this, type, containerId, dataSource, attributes);
    };

    YAHOO.lang.extend(YAHOO.widget.CartesianChart, YAHOO.widget.Chart,
    {
    	/**
    	 * Stores a reference to the xAxis labelFunction created by
    	 * YAHOO.widget.Chart.createProxyFunction()
    	 * @property _xAxisLabelFunctions
    	 * @type String
    	 * @private
    	 */
    	_xAxisLabelFunctions: [],

    	/**
    	 * Stores a reference to the yAxis labelFunctions created by
    	 * YAHOO.widget.Chart.createProxyFunction()
    	 * @property _yAxisLabelFunctions
    	 * @type Array
    	 * @private
    	 */
    	_yAxisLabelFunctions: [],

    	destroy: function()
    	{
    		//remove proxy functions
    		this._removeAxisFunctions(this._xAxisLabelFunctions);
    		this._removeAxisFunctions(this._yAxisLabelFunctions);

    		//call last
    		YAHOO.widget.CartesianChart.superclass.destroy.call(this);
    	},

    	/**
    	 * Initializes the attributes.
    	 *
    	 * @method _initAttributes
    	 * @private
    	 */
    	_initAttributes: function(attributes)
    	{
    		YAHOO.widget.CartesianChart.superclass._initAttributes.call(this, attributes);

    		/**
    		 * @attribute xField
    		 * @description The field in each item that corresponds to a value on the x axis.
    		 * @type String
    		 */
    		this.setAttributeConfig("xField",
    		{
    			validator: YAHOO.lang.isString,
    			method: this._setXField,
    			getter: this._getXField
    		});

    		/**
    		 * @attribute yField
    		 * @description The field in each item that corresponds to a value on the x axis.
    		 * @type String
    		 */
    		this.setAttributeConfig("yField",
    		{
    			validator: YAHOO.lang.isString,
    			method: this._setYField,
    			getter: this._getYField
    		});

    		/**
    		 * @attribute xAxis
    		 * @description A custom configuration for the horizontal x axis.
    		 * @type Axis
    		 */
    		this.setAttributeConfig("xAxis",
    		{
    			method: this._setXAxis
    		});

    		/**
    		 * @attribute xAxes
    		 * @description Custom configurations for the horizontal x axes.
    		 * @type Array
    		 */
    		this.setAttributeConfig("xAxes",
    		{
    			method: this._setXAxes
    		});

    		/**
    		 * @attribute yAxis
    		 * @description A custom configuration for the vertical y axis.
    		 * @type Axis
    		 */
    		this.setAttributeConfig("yAxis",
    		{
    			method: this._setYAxis
    		});

    		/**
    		 * @attribute yAxes
    		 * @description Custom configurations for the vertical y axes.
    		 * @type Array
    		 */
    		this.setAttributeConfig("yAxes",
    		{
    			method: this._setYAxes
    		});

    		/**
    		 * @attribute constrainViewport
    		 * @description Determines whether the viewport is constrained to prevent series data from overflow.
    		 * @type Boolean
    		 */
    		this.setAttributeConfig("constrainViewport",
    		{
    			method: this._setConstrainViewport
    		});
    	},

    	/**
    	 * Getter for the xField attribute.
    	 *
    	 * @method _getXField
    	 * @private
    	 */
    	_getXField: function()
    	{
    		return this._swf.getHorizontalField();
    	},

    	/**
    	 * Setter for the xField attribute.
    	 *
    	 * @method _setXField
    	 * @private
    	 */
    	_setXField: function(value)
    	{
    		this._swf.setHorizontalField(value);
    	},

    	/**
    	 * Getter for the yField attribute.
    	 *
    	 * @method _getYField
    	 * @private
    	 */
    	_getYField: function()
    	{
    		return this._swf.getVerticalField();
    	},

    	/**
    	 * Setter for the yField attribute.
    	 *
    	 * @method _setYField
    	 * @private
    	 */
    	_setYField: function(value)
    	{
    		this._swf.setVerticalField(value);
    	},

    	/**
    	 * Receives an axis object, creates a proxy function for
    	 * the labelFunction and returns the updated object.
    	 *
    	 * @method _getClonedAxis
    	 * @private
    	 */
    	_getClonedAxis: function(value)
    	{
    		var clonedAxis = {};
    		for(var prop in value)
    		{
    			if(prop == "labelFunction")
    			{
    				if(value.labelFunction && value.labelFunction !== null)
    				{
    					clonedAxis.labelFunction = YAHOO.widget.Chart.getFunctionReference(value.labelFunction);
    				}
    			}
    			else
    			{
    				clonedAxis[prop] = value[prop];
    			}
    		}
    		return clonedAxis;
    	},

    	/**
    	 * Removes axis functions contained in an array
    	 *
    	 * @method _removeAxisFunctions
    	 * @private
    	 */
    	_removeAxisFunctions: function(axisFunctions)
    	{
    		if(axisFunctions && axisFunctions.length > 0)
    		{
    			var len = axisFunctions.length;
    			for(var i = 0; i < len; i++)
    			{
    				if(axisFunctions[i] !== null)
    				{
    					YAHOO.widget.Chart.removeProxyFunction(axisFunctions[i]);
    				}
    			}
    			axisFunctions = [];
    		}
    	},

    	/**
    	 * Setter for the xAxis attribute.
    	 *
    	 * @method _setXAxis
    	 * @private
    	 */
    	_setXAxis: function(value)
    	{
    		if(value.position != "bottom" && value.position != "top") value.position = "bottom";
    		this._removeAxisFunctions(this._xAxisLabelFunctions);
    		value = this._getClonedAxis(value);
    		this._xAxisLabelFunctions.push(value.labelFunction);
    		this._swf.setHorizontalAxis(value);
    	},

    	/**
    	 * Setter for the xAxes attribute
    	 *
    	 * @method _setXAxes
    	 * @private
    	 */
    	_setXAxes: function(value)
    	{
    		this._removeAxisFunctions(this._xAxisLabelFunctions);
    		var len = value.length;
    		for(var i = 0; i < len; i++)
    		{
    			if(value[i].position == "left") value[i].position = "bottom";
    			value[i] = this._getClonedAxis(value[i]);
    			if(value[i].labelFunction) this._xAxisLabelFunctions.push(value[i].labelFunction);
    			this._swf.setHorizontalAxis(value[i]);
    		}
    	},

    	/**
    	 * Setter for the yAxis attribute.
    	 *
    	 * @method _setYAxis
    	 * @private
    	 */
    	_setYAxis: function(value)
    	{
    		this._removeAxisFunctions(this._yAxisLabelFunctions);
    		value = this._getClonedAxis(value);
    		this._yAxisLabelFunctions.push(value.labelFunction);
    		this._swf.setVerticalAxis(value);
    	},

    	/**
    	 * Setter for the yAxes attribute.
    	 *
    	 * @method _setYAxes
    	 * @private
    	 */
    	_setYAxes: function(value)
    	{
    		this._removeAxisFunctions(this._yAxisLabelFunctions);
    		var len = value.length;
    		for(var i = 0; i < len; i++)
    		{
    			value[i] = this._getClonedAxis(value[i]);
    			if(value[i].labelFunction) this._yAxisLabelFunctions.push(value[i].labelFunction);
    			this._swf.setVerticalAxis(value[i]);
    		}
    	},

    	/**
    	 * Setter for the constrainViewport attribute
    	 *
    	 * @method _setConstrainViewport
    	 * @private
    	 */
    	_setConstrainViewport: function(value)
    	{
    		this._swf.setConstrainViewport(value);
    	},

    	/**
    	 * Sets the style object for a single series based on its index
    	 *
    	 * @method setSeriesStylesByIndex
    	 * @param index {Number} The position within the series definition to apply the style
    	 * @param style {object} Style object to be applied to the selected series
    	 */
    	setSeriesStylesByIndex:function(index, style)
    	{
    		style = YAHOO.lang.JSON.stringify(style);
    		if(this._swf && this._swf.setSeriesStylesByIndex) this._swf.setSeriesStylesByIndex(index, style);
    	}
    });

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